Quote:
Originally Posted by catman
G'day all, I admit that I have a 'thing' about hi fi/good sounding AM receivers/tuners, but my Henry Kloss/Tivoli AM/FM table radio is something that I never want to part with. I love it to pieces, and it sounds great!
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I picked up a Trivoli AM/FM set a couple weeks ago at a garage sale. Worked nice, and modified the AM with a wider IF ceramic filter I salvaged from an old analog (first generation) cell car phone. A MuRata CFL455AG2 about 18KHz wide, meant for narrow band FM work, but it doesn't know nor care that it's passing AM at 455KHz.
There's a 1.5K resistor between pins 2 and 5, to make the load impedance 1K (the chip presents 3K). Also used a 330K resistor across L5, the 2nd 455KHz filter, to make it wide.
Got it working nicely, then was about to button it up, fumbled the board, and shorted the 1.4V RF ground line (pin 5) of the TEA5710 chip to something on the adjacent board that holds the band switch and the volume control, and the chip died...
Went on ebay and ordered some TEA5710 chips from some outfit in China, expect them to arrive around July 15th...